Electric water-heater.



-P'. MISPEL. ELECTRICWATER HEATER. APP HCATION FILED {EB- 9, 1918.

1 23 05 v V N A Patented Oct. 8, 191a 1 02M MAP/06X l .WITNESSES UNITEDSTATES PATENT OFFICE.

PAUL MI-SPEL, OF NEW LENOX, MASSACHUSETTS.

ELECTRIC WATER-HEATER.

To all whom it concern Be it known that I, PAUL Mxsrnn, a citizen of theUnited States, residing at New Lenox, in the count of Berkshire andState of Massachusetts, lave invented new and useful Improvements inElectric Water- Heaters, of which the following is a specification.

This invention relates to new and useful improvements in electric waterheaters and the principal object of the invention is to provide anefficient arrangement of parts for-preventing the short-circuiting ofthe electric current and to prevent the loss of heat from. the device.

Another object of the invention is to 1'0 Side, :1 device of thischaracter whic is simple and durable in construction, reliable andefficient in operation and one which can be manufactured and placed uponthe market at a minimum cost.

The invention also consists in certain other features of constructionand in the combination and arrangement of the several parts, to behereinafter fully described, illustrated in the accompanying drawingsand specifically pointed out in the. appended c aim.

In describing my invention in detail, reference will be had to theaccompanying drawings wherein like characters denote like orcorresponding parts throughout the several views, and in which Figure 1is an elevation of the. heater in use.

Fig. 2 is a longitudinal section through the heater.

Fig. 3 is an enlarged elevation with parts broken away through theheater.

Fig. 4 is a detail sectional view through the end cover and showing thesocket through which the terminal passes.

Fig. 5 is a plan view of the recessed collar.

As shown in these views. the boiler is shown at A and the heater at B. Cindicates the pipes connecting the heater with the boiler. The heaterconsists of the pipe 1 which is adapted to be connected with the pipes Gand through which the water to be heated passes. This pipe is providedwith a collar 2 and. a collar 3 which is provided with diametricallyopposite recesses 3'.

The portion of the pipe between the collars is provided with suitableinsulating material such as powdered soap-stone formed into aSpecification 0! Letters Patent.

soa p-stone.

Patented-Oct. s, 1918.

Application filed February 9, 1918. Serial No. 216,294.

paste and baked on the pipe as shown at 4. lhe wire 6 is then coiled onthis material and the terminals 5 of said wire project through therecesses 3. As shown in the drawing the wire is coiled around theinsulating material, beginning at the up er and of the device and at thelower end t e wire is looped and coiled in. the opposite direction backto the upper end of the device. Care must be taken that the terminals 5do not comein contact with the collar 3 and the recesses 3 are filledwith the powdered I The wire coil is then covered with another layeroil-powdered soap-stone and this layer is to entirely fill the spacebetween the collars so that its outer surface will be flush with saidcollars. A tube 7 is then placed on the collars and this tube is to havea tight fit thereon so as to entirely surround the insulating materialand said collars. A brass tube 8 is then placed around said pipe 7 andsecured thereto, by a its ends turned inwardly to engage said in tubeand these ends are secured to the tube 8 to form an air tight connectiontherewith. A nipple 11 is left on the tube 10 to receive an air pump forremoving the air from the space between the tubes. As soon as the air isremoved this nipple is then closed in any suitable manner. 12 indicatesa cover for one end of the heater which is secured to the end of thetube 8 by the screws 13. The sides of this cover are provided with thein'- sulated sockets 14 through which pass the conductors 15 which areconnected with the terminals 5.

It will thus be seen that the coils are well insulated from the innerwater tube 1 and the surrounding tube 7 and heat is prevented fromescaping from the heater by of water pipe. a pair of co lars thereon.one of said collars having recesses therein, a 001i lueated between thecollars and having its ,ends projecting through said recesses,insulating material fillin the space between the collars and sum' un mgthe cells, a pipe engagin with said collars and surrounding the insuiting material, a pair of brass tubes forming a vacuum. space andsurrounding said last mentioned pipe, it cover connected with one end ofsaid brass tubes and havlng sockets therein, and conductor members se-10

